One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,10)(8,11)(9,12)(13,14,20,17)(15,25,27,22)(16,28,26,21)(18,23,19,24)(1,2,3,4)(5,7)(6,9)(8,12)(10,11)(13,15,18,26,20,27,19,16)(14,21,24,25,17,28,23,22)(7,12)(9,10)(13,16,19,27,20,26,18,15)(14,22,23,28,17,25,24,21)(5,7)(6,10)(8,12)(9,11)(13,17,20,14)(15,21,27,28)(16,22,26,25)(18,23,19,24)(7,12)(9,10)(13,18,20,19)(14,23,17,24)(15,26,27,16)(21,22,28,25)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.